Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-09-19
2006-09-19
Kim, Kevin (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
Reexamination Certificate
active
07110439
ABSTRACT:
A system is provided for use with a multi-user detector MUD, which dramatically decreases the processing time for separating out interfering transmissions from a number of users by eliminating from each processing iteration consideration of those bit estimates for which the probability or estimate of their value exceeds a predetermined threshold and can therefore be declared “certain”. In a Turbo MUD environment in which the output of the MUD is coupled back to the MUD through an error correction system, the output of the error correction is thresholded such that those bit estimates having probabilities or estimates greater than a predetermined threshold are assigned a quantized value and are eliminated from further processing by the MUD. For certain low-complexity processing Turbo MUDs there can be as much of a reduction as one-third in processing time, whereas for full MUD processing, the reduction in processing time can be as much as 1/30th.
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BAE Systems Information and Electronic Systems Integration Inc.
Kim Kevin
Long Daniel J.
Tendler Robert K.
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